class_docstr: Test scatterplot.
class_docstr_tok: ["Test","scatterplot","."]
code: def test_wordcloud(self):
      s = pd.Series("one two three")
      self.assertEqual(visualization.wordcloud(s), None)
  
file_path: texthero/tests/test_visualization.py
imports: import string
  import pandas
  import doctest
  from texthero import visualization
  from .None import PandasTestCase
label_desc: Use image node_id 10 for calling the TestVisualization obj's underlying member method code with example usage: obj.test_wordcloud() without return types